News Articles D3.js

How to avoid .lower() to reshuffle elements in d3?

I have following d3 code that I use to draw bottom layer below all other elements of the chart: const rectsEnter = vis.g.selectAll(‘rect.bottomLayer’).data(data).enter() const rectsUpdate = vis.g.selectAll(‘rect.bottomLayer’).data(data) vis.g.selectAll(‘rect.bottomLayer’).data(data).exit().remove() rectsEnter.append(‘rect’) .attr(‘class’, ‘bottomLayer’) .attr(‘fill’, ‘grey’) .attr(‘x’, x) .attr(‘y’, (d, i) => i*size) .attr(‘width’, 0) .attr(‘height’, height) .lower() .transition() .attr(‘width’, newWidth) rectsUpdate .lower() .transition() .attr(‘x’, x) .attr(‘y’, (d, […]

In Tampermonkey, why does @require work for some scripts but not others

I’m trying to write a userscript using TamperMonkey on Chrome. I want to use https://github.com/Fil/d3-geo-voronoi so I put this in my script header: // @require https://cdn.jsdelivr.net/npm/[email protected]/dist/d3.min.js // @require https://cdn.jsdelivr.net/npm/[email protected]/dist/d3-delaunay.min.js // @require https://cdn.jsdelivr.net/npm/[email protected]/dist/d3-geo-voronoi.min.js d3 and d3-delaunay are imported correctly but for some reason, d3-geo-voronoi is not. I can see in the chrome dev tools sources tab […]

d3.js dendogram how to add links to leaf nodes and change colors

I’m building this dendogram with D3.js and I’m fairly new to this so I’m having some trouble finding out how I’d add URLs to the leaf nodes (Ideally if I could use a python dictionary or a list to tell d3 which leaf nodes have which links that’d be perfect) and also how to change […]

How to create range based ticks in chart js? (like in attached image)

So I am trying to create a third axis on right like this, where I can pass range for low normal and high value, but I can’t seem to find anything on how to do this on a range basis. Here is a quick fiddle with chartjs linked and basic data to easily edit : […]

How to put different SVG into a grid with D3.js?

I have lots of svg element containing each one a line chart. I’d like to display these charts at groups of four. If I understand well from the documentation, it’d be better to use a grid for this purpose since I can select position I want (single box of the grid) for a specific graph. […]

Hide the first element of the organizational structure d3.js

I’m a beginner in d3 js, trying to modernize the organizational structure, And I need to hide the first structure element, an example is shown in the picture, the code is taken from github https://observablehq.com/@bumbeishvili/d3-v5-organization-chart Source: JavaSript – Stack Overflow

d3.js + GEOJSon Map not Showing

I’m working on a D3 map that shows a basic map. I have been trying for hours with all sorts of different code to try and get it to display, but I have been unsuccessful in making the map appear in browser.I am a new to d3.js and am pretty amateur. I can see that […]

d3.js + GEOJSon Map not Showing

I’m working on a D3 map that shows a basic map. I have been trying for hours with all sorts of different code to try and get it to display, but I have been unsuccessful in making the map appear in browser.I am a new to d3.js and am pretty amateur. I can see that […]

D3 – How to create multiple line charts from an array of objects

I am trying to create multiple line charts from an array of objects but having difficulty of understanding how to bind the data and create the Y and X axes correctly. Below is a shortened version of the data that I am working with: var prices = [{ "pagination": { "count": 6, }, "data": [ […]

useCallback does not update on dependency in specific circustamces

I have a select function that is initialized using useCallback using single dependency: name. Then I pass this function to some nested components to be called on click on a chart element. If I pass the function the way I do (see the example below), it turns out that dependency name of useCallback is never […]

Python Flask CORS error caused by D3 failure to fetch

I have test website here. I have already enabled CORS in my code. It got CORS errors, which I suspected to come from D3 fetch methods. This is one of them: function SetupSpeciesDropdown() { var url = "http://127.0.0.1:5000/getobsspecieslist" //var url = "http://www.cocostraws.com/getobsspecieslist" fetch(url, {mode: ‘cors’}).then(res => res.json()).then(function(speciesList) { d3.select("select#dropdown") .selectAll(‘myOptions’) .data(speciesList["result"]) .enter() .append(‘option’) .text(function (d) […]

D3.js v5 – simple streamgraph not rendering

In the following snippet, I have an extremely simplified streamgraph using hard coded data and minimal styling. var margin = {top: 20, right: 30, bottom: 0, left: 10}, width = 900 – margin.left – margin.right, height = 450 – margin.top – margin.bottom; var svg = d3.select(“body”) .append(“svg”) .attr(“width”, width + margin.left + margin.right) .attr(“height”, height […]

How to integrate real-time data into d3 charts in react

I’m going to create a real-time data chart with D3. Frame work is React, but the data value that keeps changing comes only once. What should I do to stack up the data? Is it because of the useEffect? But when I do it, I have to use d3 in this hook so that there […]

How to get correct grid container value in angular

I am new to angular. I am trying to make d3 visualization in angular. I divided the interface into grid-container and set each container with an id. When I am trying to get the container height in the typescript, the value is not correct. I have no clue where I am doing wrong as I […]

Tooltip in d3.js

I have the chart fully. the problem lies in the exact design which I’m trying to get. Problems I’m having problem with the design issues text not centered in the container The code that I’m currently using is as below <!DOCTYPE html> <meta charset="utf-8"> <!– Load d3.js –> <script src="https://d3js.org/d3.v6.js"></script> <!– Create a div where […]

Speeding up force simulations with spirals

D3.js force simulations are great for implementing basic physical rules, but they can be expensive to run. Here’s a trick I’ve used in the past to speed up those simulations. Source: Amelia Wattenberger

How to learn D3.js

So, you want to create amazing data visualizations on the web and you keep hearing about D3.js. But what is D3.js, and how can you learn it? Let’s start with the question: What is D3? While it might seem like D3.js is an all-encompassing framework, it’s really just a collection of small modules. Here are […]

Interactive Charts with D3.js

You did it! You grabbed a data set and visualized it, right here in the browser. Congratulations, that is no easy feat! This is 2019 and the web browser opens up a whole new realm of possibilities when visualizing data. Let’s take advantage of these new possibilities and talk about how to take your chart […]

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Senior Software Developer

Creator of @LzoMedia I am a backend software developer based in London who likes beautiful code and has an adherence to standards & love's open-source.